marto@Shemp:~/code$ ./rubbish.pl 
Content-type: text/plain

Useless use of a constant ("currency") in void context at ./rubbish.pl line 25.
Useless use of a constant ("USD") in void context at ./rubbish.pl line 25.
Useless use of a constant ("amount") in void context at ./rubbish.pl line 25.
Useless use of a constant ("500") in void context at ./rubbish.pl line 25.
Useless use of a constant ("description") in void context at ./rubbish.pl line 25.
Useless use of a constant ("hey") in void context at ./rubbish.pl line 25.
Useless use of a constant ("internal") in void context at ./rubbish.pl line 25.
Argument "Key" isn't numeric in subtraction (-) at ./rubbish.pl line 13.
Argument "Apiauth" isn't numeric in subtraction (-) at ./rubbish.pl line 13.
Argument "Nonce" isn't numeric in subtraction (-) at ./rubbish.pl line 13.
Argument "Apiauth" isn't numeric in subtraction (-) at ./rubbish.pl line 13.
Argument "Signature" isn't numeric in subtraction (-) at ./rubbish.pl line 13.
Argument "Apiauth" isn't numeric in subtraction (-) at ./rubbish.pl line 13.
failure: 400